Johnson, Nemaha Co., Nebraska, USA
|Latitude & Longitude (WGS84):||40° 24' 39'' North , 95° 59' 53'' West|
|Latitude & Longitude (decimal):||40.41083,-95.99806|
|Köppen climate type:||Dfa : Hot-summer humid continental climate|
From geodes in Permian Hughes Creek Shale in creek beds
1 valid mineral.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
252.17 - 298.9 Ma
|Council Grove Group|
Age: Permian (252.17 - 298.9 Ma)
Stratigraphic Name: Council Grove Group
Description: Shale and interbedded limestone. Shale is gray, green, red, reddish brown, or maroon, sandy, calcareous, fossiliferous, locally fissile; several fissile black shale beds are in lower 75 feet. Interbedded dark- to light-gray, medium- to thick-bedded, argillaceous, cherty limestone beds are very fossiliferous and locally contain shale partings. Approx. max thickness 300 ft
Comments: Middle part of Big Blue Series - Includes in decending order: Speiser Shale, Funston Limestone, Blue Rapids Shale, Crouse Limestone, Easly Creek Shale, Bader Limestone, Stearns Shale, Beattie Limestone, Eskridge Shale, Grenola Limestone, Roca Shale, Red Eagle Limestone, Johnson Shale, and Foraker Limestone.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.